What size will you be after you lose weight?

November 14, 2014
By

(This article was first published on Decision Science News » R, and kindly contributed to R-bloggers)

REDDITORS’ BEFORE AND AFTER MEASUREMENTS ANALYZED

reddit_before_after

Click to enlarge

How many pounds do you need to lose in order to reduce your waistline by one inch? How many kilos do you need to lose to reduce your waistline by one centimeter?

We wanted to find out. We were having trouble finding published data (though we are expecting some soon), so we turned to Reddit, where the progresspics subreddit contains people’s before-and-after weight change stories. Most posts contain only pictures, but if you do some web scraping, you can find cases in which people post their before-and-after waist measurements.

We found 46 such cases, typed them up, ran them through R, tidyr, dplyr, and ggplot and made the picture above.

Multiple regression tells us that on average, for every 8.5 pounds lost, people dropped an inch off their waist. (And for every 1.5 kilograms lost, people dropped a centimeter off their waist.)

Every 10 pounds lost was accompanied by 1.18 inches of waistline reduction. (Every 5 kg lost was accompanied by 3.33 cm of waistline reduction.)

The picture is a bit rosier for those who were losing smaller amounts (under 55 pounds or 25 kg): They only had to lose 6.1 pounds to lose an inch (or 1.1 kg to lose a centimeter).

Want to see the data split out by gender? Voila:

reddit_before_after_gender

Click to enlarge

Want to make this graph yourself? OK.

Why am I doing this? Hal are following up our face morphing stuff with body morphing stuff.

The post What size will you be after you lose weight? appeared first on Decision Science News.

To leave a comment for the author, please follow the link and comment on their blog: Decision Science News » R.

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